Kappa Persei
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Kappa Persei or κ Persei, is a triple star system in the northern constellation of Perseus. Based upon an annual parallax shift of 28.93 mas,[1] it is located at a distance of 113 light-years from the Sun.
The system consists of a spectroscopic binary,[9][6] designated Kappa Persei A, which can be seen with the naked eye, having an apparent visual magnitude of 3.80.[2] The third star, designated Kappa Persei B, is of magnitude 13.50.[10]
Kappa Persei A's two components are designated Kappa Persei Aa (officially named Misam Template:IPAc-en, the traditional name of the entire system)[11] and Ab.
Nomenclature
κ Persei (Latinised to Kappa Persei) is the system's Bayer designation. The designations of the two constituents as Kappa Persei A and B, and those of A's components - Kappa Persei Aa and Ab - derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).[12]
The traditional name comes from the Arabic مِعْصَم miʽṣam 'wrist'.
In 2016, the IAU organized a Working Group on Star Names (WGSN)[13] to catalog and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems.[14] It approved the name Misam for the component Kappa Persei Aa on 5 September 2017 and it is now so included in the List of IAU-approved Star Names.[11]
In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Mausoleum, refers to an asterism consisting of Kappa Persei, 9 Persei, Tau Persei, Iota Persei, Beta Persei (Algol), Rho Persei, 16 Persei and 12 Persei. Consequently, the Chinese name for Kappa Persei itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.).[15]
Properties
At its distance, the visual magnitude of Kappa Persei is diminished by an extinction factor of 0.06 due to interstellar dust.[6] It has a relatively high proper motion totaling 0.230 arcseconds per year.[16] There is a 76.3% chance that it is a member of the Hyades-Pleiades stream of stars that share a common motion through space.[6]
With an estimated age of 4.58 billion years,[7] Kappa Persei Aa is an evolved G-type giant star with a stellar classification of G9.5 IIIb.[4] It is a red clump giant, which means that it is generating energy at its core through the nuclear fusion of helium.[3] The star has about 1.5[7] times the mass of the Sun and 9[5] times the Sun's radius. It radiates 40[7] times the solar luminosity from its outer atmosphere at an effective temperature of 4,857 K.[7]
Kappa Persei B is at an angular separation of 44.10 arc seconds along a position angle of 319°, as of 2009.[10]
References
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- ↑ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 11 日 Template:Webarchive
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